The development of radiocarbon dating allows scientists to see how many times carbon atoms have been through half-lives. Since scientists know the length of a C- 14 half-life, they can gain knowledge about fossils using the C-14 dating technique. When radiocarbon dating was first introduced, it changed the way people thought about how organisms evolved because the technique showed
A. how long ago some organisms were alive
B. that eating habits have changed in some animals
C. how different the chemical composition was long ago
D. that most plants were gymnosperms
Answer: A. how long ago some organisms were alive
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Animal cells typically achieve cytokinesis by:
A. binary fission. B. forming a cell plate across the middle of the cell. C. forming a cleavage furrow that pinches the cell into two. D. chromosome condensation. E. chromosome elongation.
Industrial melanism is a term
A. describing the color change induced by living in industrialized areas. B. explaining that the darker moths have higher mutation rates because of industrialization. C. describing the evolutionary process in which initially light-colored organisms become dark as a result of natural selection. D. explaining that the darker moths having higher reproductive success because of their pigmentation. E. describing the widespread implementation of pollution controls.
This process in the life cycle of Rhizopus stolonifer, a bread mold, is an example of _____
1.asexual reproduction via spores
2.asexual reproduction leading to the production of mycelium
3.sexual reproduction involving two hyphae
4.zygomycosis inside blood vessels
The master gene Hox helps to sculpt the body
plan of embryos by a. inhibiting the Dlx gene to prevent extra limbs. b. timing the activation of Dlx genes. c. causing cell death in any cell not expressing the Hox gene. d. converting sugar into energy to allow the process to go to completion. e. inducing mutations in plants.